A Sensitive Aptasensor Based on a Hemin/G‐Quadruplex‐Assisted Signal Amplification Strategy for Electrochemical Detection of Gastric Cancer Exosomes. Issue 19 (8th April 2019)

• Record Type: Journal Article
• Authors: Huang, Rongrong; He, Lei; Xia, Yanyan; Xu, Hongpan; Liu, Chang; Xie, Hui; Wang, Su; Peng, Lijun; Liu, Yufeng; Liu, Yuan; He, Nongyue; Li, Zhiyang
• Is Part Of: Small. Volume 15:Issue 19(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-04-08
• Subjects: aptamers -- electrochemical -- gastric cancer exosomes -- rolling circle amplification; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.201900735
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: Emerging evidence indicates that exosomes derived from gastric cancer cells enhance tumor migration and invasion through the modulation of the tumor microenvironment. However, it remains a major problem to detect cancer‐specific exosomes due to technical and biological challenges. Most of the methods reported could not achieve efficient detection of tumor‐derived exosomes in the background of normal exosomes. Herein, a label‐free electrochemical aptasensor is presented for specific detection of gastric cancer exosomes. This platform contains an anti‐CD63 antibody modified gold electrode and a gastric cancer exosome specific aptamer. The aptamer is linked to a primer sequence that is complementary to a G‐quadruplex circular template. The presence of target exosomes could trigger rolling circle amplification and produce multiple G‐quadruplex units. This horseradish peroxidase mimicking DNAzyme could catalyze the reduction of H2 O2 and generate electrochemical signals. This aptasensor exhibits high selectivity and sensitivity toward gastric cancer exosomes with a detection limit of 9.54 × 10 2 mL −1 and a linear response range from 4.8 × 10 3 to 4.8 × 10 6 exosomes per milliliter. Therefore, this electrochemical aptasensor is expected to become a useful tool for the early diagnosis of gastric cancer. Abstract : Detecting cancer‐specific exosomes remains a major problem due to technical and biological challenges. Herein, a label‐free electrochemical aptasensor is presented for specific detection of gastric cancer exosomes. This electrochemical aptasensor is expected to become a useful tool for the early diagnosis of gastric cancer.